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/*****************************************************************************
* Copyright (c) 2014, 2016 CEA LIST, Christian W. Damus, and others.
*
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* CEA LIST - Initial API and implementation
* Christian W. Damus (CEA) - bug 417409
* Christian W. Damus - bug 485220
*
*****************************************************************************/
package org.eclipse.papyrus.infra.viewpoints.policy;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.papyrus.infra.constraints.Activator;
import org.eclipse.papyrus.infra.constraints.ConstraintDescriptor;
import org.eclipse.papyrus.infra.constraints.constraints.Constraint;
import org.eclipse.papyrus.infra.constraints.runtime.ConstraintEngine;
import org.eclipse.papyrus.infra.constraints.runtime.ConstraintFactory;
import org.eclipse.papyrus.infra.constraints.runtime.DefaultConstraintEngine;
import org.eclipse.papyrus.infra.architecture.representation.ModelRule;
/**
* {@link ConstraintEngine} for viewpoint {@link ModelRule}
*/
public class ModelRuleConstraintEngine extends DefaultConstraintEngine<ModelRule> {
protected final Map<ModelRule, List<Constraint>> modelRule2Constraints = new HashMap<ModelRule, List<Constraint>>();
/** singleton instance */
private static ModelRuleConstraintEngine instance;
/**
* Not instantiable by clients.
*/
public ModelRuleConstraintEngine() {
super(ModelRule.class);
}
/**
* {@inheritDoc}
*/
@Override
public void refresh() {
modelRule2Constraints.clear();
fireConstraintsChanged();
}
public boolean matchesRule(ModelRule rule, EObject element) {
Collection<EObject> selection = Collections.singletonList(element);
List<Constraint> constraints = getConstraintsFor(rule);
if (constraints == null || constraints.size() == 0) {
return true;
}
for (Constraint c : constraints) {
try {
if (!(c.match(selection))) {
return false;
}
} catch (Throwable ex) {
Activator.log.error(ex);
}
}
return true;
}
/**
* Initialize and return the list of constraints for a given rule
*
* @param rule
* the rule to check
* @return the list of constraints for the specified rule or an empty list if no rule is registered for the rule
*/
protected List<Constraint> getConstraintsFor(ModelRule rule) {
if (!modelRule2Constraints.containsKey(rule)) {
List<Constraint> constraints = initializeConstraints(rule);
modelRule2Constraints.put(rule, constraints);
}
return modelRule2Constraints.get(rule);
}
/**
* Initialize constraints for a given rule
*
* @param rule
* the rule that contains the constraints
* @return the list of constraints for the given rule or an empty list if no constraints were found for the given rule
*/
protected List<Constraint> initializeConstraints(ModelRule rule) {
List<ConstraintDescriptor> descriptors = rule.getConstraints();
if (descriptors == null || descriptors.size() == 0) {
return Collections.emptyList();
}
List<Constraint> constraints = new ArrayList<Constraint>();
for (ConstraintDescriptor descriptor : descriptors) {
try {
Constraint constraint = ConstraintFactory.getInstance().createFromModel(descriptor);
if (constraint != null) {
constraints.add(constraint);
}
} catch (Throwable e) {
Activator.log.error(e);
}
}
return constraints;
}
public static synchronized ModelRuleConstraintEngine getInstance() {
if (instance == null) {
instance = new ModelRuleConstraintEngine();
}
return instance;
}
}
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